Slack, the team chat service that helps employees remain in constant contact, has a number of applicable widgets. However, the lack of facial cues and body language when using it means that it can be hard to tell how team morale is going on any given workday. Vibe is a new add-on for the service that can help managers figure out how the workers on their channels are feeling. The Slack plugin acts as a silent observer, using natural language processing algorithms to detect language patterns that indicate happiness, irritation, disappointment, and stress.

It tracks them over a timeline, and indicates the general level of feeling.

The add-on is free for one channel, though costs $50 a month for more channels and topic analysis, or for $120 a month, it can pinpoint what caused any drops in morale. A feature like Vibe isn’t perfect, but it can help managers keep their teams happy and working well together.